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3x-10x+7=-9+286
We move all terms to the left:
3x-10x+7-(-9+286)=0
We add all the numbers together, and all the variables
3x-10x+7-277=0
We add all the numbers together, and all the variables
-7x-270=0
We move all terms containing x to the left, all other terms to the right
-7x=270
x=270/-7
x=-38+4/7
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